Surface topology modification of organic substrates using material jetting technologies

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Jessirie Dilag Stuart Bateman Tiffany Chen
Abstract	The ability to directly modify the topology of a surface with three-dimensional micron-scale features provides both a mechanism of controlling how it interacts with the surrounding environment and the potential to impart functional features. Using direct material jetting based additive manufacturing technologies, we report the direct printing of microstructures onto aluminium coupons previously finished with polyurethane (PU) coatings where the overcoat window proved crucial for this process. The effect of PU coating's age on the development of strong interfacial interactions and hence the level of adhesion achieved between the photopolymer and the topcoat was explored. With aging, the PU coatings were shown to increase in cross-link density which resulted in reduced levels of adhesion with the photopolymer observed. This was reflected in changes in surface energy hence surface chemistry via XPS analysis. Changes in the interfacial interactions were qualitatively examined through SEM analysis of the photopolymer – PU coating interface which showed localized debonding (de-wetting) of the photopolymer when printing was performed on aged PU topcoats.
Related Links	http://www.sciencedirect.com/science/article/pii/S0264127520306511
ISSN	18734197
DOI	10.1016/j.matdes.2020.109116
Journal	Materials & Design
Volume Number	196
Language	English
Publisher	Elsevier
Publisher Date	2020-01-01
Publisher Place	United Kingdom
Access Restriction	Open
Subject Keyword	Materials of Engineering and Construction. Mechanics of Materials Additive Manufacturing Material Jetting Aerospace Coating Interfacial Adhesion Polyurethane Biomimetic
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering